Tushnet and Amar’s Global Perspectives on Constitutional Law is a slender volume, essentially a miniature comparative constitutional law textbook, almost a supplement to Jackson & Tushnet’s Documentary Supplement to Comparative Constitutional Law 2005 (University Casebooks). This book covers some topics that earlier textbook doesn’t such as campaign finance. Each chapter excerpts cases on the topic from various jurisdictions. Unfortunately, as is the case with many comparative law texts, each subjects covers only a few jurisdictions, so it’s difficult to know whether they’re really representative. Some of the notes are pretty useful and can serve as a guide to further sources.